"Julie Andrews To CU-Boulder Grads: ‘Be An Ambassador For The Kind Of World That You Want To Live In’". The Boulder Daily Camera with Brittany Anas, www.huffingtonpost.com. May 10, 2013.
John Muir (1997). “Nature Writings: The Story of My Boyhood and Youth, My First Summer in the Sierra, the Mountains of California, Stickeen, Selected Essays”, p.739, Library of America